And john



VE. B. CRAFT AND-J. N. REYNOLDSQN'; AUTOMATIC TELEPHUNE EXCHANGE svsTEM.

APPLICATION FILED APR. `191:9."M' Reissucd Apr. 25, 1922. 15 ,341.

35Min-SHEET' l.

by Affy.

E. -B. CRAFT AND.J. N. REYNOLDS. AUTOMATIC eLfPHoNE EXCHANGE SYSTEM. APPLICATION FI LED APR. T. 12H9.

Beissued Apr. 25, 1922. 15,341.

SH ETS-SHEET 2.

/H Vie/#oni Edward 5. Cra/ ./0/7/7l Reyna/d5. by Afflv.

E. B. CRA-FT AND I. N. REYNOLDS. AUTOMATIC TELEPHONE EXCHANGE SYSTEM.

APPLICATION FILED APR. 7, 1919.

15,341. il 3 fHEETS-SHEET 3.

Reissued Apr. 25, 1922.

by A fs WM Cn 5w, 4P.. In a@ 45 forj identifying engaged lines.

e UNITED om@ EDWARD n. CRAFT. or H'AcxENsA'cx, NEW JEEsEY,

AND JOHN NEWBEREY EEYNoLDs, or GEEE'NWICH, CONNECTICUT; AssieNoEs, Br MEsNEAssIGN- MENTS, 'To WESTERN ELECTRIC. coMraN-Y, INCORPORATED,V or NEW YORK, s N. Y.,.A jooEronATIoN or NEW4 YORK., f f v au'roismfrrc TELEPHoNE EXCHANGE SYSTEM.

i Specification of Reissue@ Letters latent. v Reissued A131325, 1922.v

lorirginal VNo. 1,267,980, dated-.May 28, 1.918, Se'ria'l No.A 878047, fled December 19, 1914. 'Application for.

` l reissue filed April?, 191.9. vSerial No. 288,403;

'To dlivfhmmayowemf Be. it: known that-We, EDWARD Br CRAFT 'and .Jen-N N. REYNOLDS, citizenswof the United States, residing aty Hackensack, in 5 the county of Bergen' and sey, and.. at Greenwich, l inthe county of .l Fail-held and Stateoi` Connecticut, respec-v tively, have invented certain new.V and use! ful Improvementsin Automatic Telephone- Exchange Systems, ot which the tollowing l is a fullLclear, concise, and exact descrip-k tion. y This invention, in some respects, relates to telephone exchange systems generally,but it is' applicable more particularly .to systems employing automatic switches. for distribut- Y ingfcallsto conneetingfcircuits of operators positions. f

In one respect its object is t0A ladapt an H tomatic switch ofza type having multiple connected brushes for luse as a .quick-acting' line or ,trunk finder, and vto this/.endthe brush selecting'. 'mechanismv of the switch is adapted for adjustmentin accordancewith the group in which-theterminal of a selectable line or trunk lines, and .the brushcarrier ,4 element'is vadjusted in accordance with the location of the ter-minal'inythat group. .1.

In. another respect. its object is to gain 'time' in extending a connection to a call receifving device, suchfasan operatorsj tele. phone. vThe invention in'this respect is especialyly applicable topaicalldistributing.sysf y tem, .wherein a two movement automatmv first to find.

switching mechanism operates i an .idle operators positionj -and thento'find y an idle connecting circuit/in. that position. Asthus applied-it provides Jfor the connec-v tion of the operators set In another.v respect', 'applicablev to `auto*` I matic switching systems in. telephonel exchanges generally, its .obj,ect is to vproyide.

` easily.manipulatedsnd Simplemehanism Y y .fr0 this yend each line is provided with identifying .means operating over connections preer-ably established .by the yautomatic switching apparatus fromnny, operators position.

In another. respect, its ob] ect simplefmeans or `effecting lanumber.J ofdii-- To this end,

ferent identifications ota line.

State' OYN'QW Jeff iicationl atv another time.

tothe line `calling 40-1intherst switching movement.

is .to provide Aingline,` and means for identifying it to the operatorfas a' particular callingk line. This lis'jdone.oi/1er a path that is used. for one lidentification'at one time andlor another identi- 'In anotherrespect,- applicable/to` systems for distributing calls to operators ypositions orto systems in which lines v'are connected through automatic" switches in series, its ob ject is toenable the operator. 'torender a connected line available orother connections sov while continuing -thelconnectionalready es-" tablished. To this end 'preferably the circuit of a cut-ofrelayfor the line is extended to theoperators position, a key being provided Ytor con-trolling tha-teircuit.` y y These and other features of this invention will be more fully/considered 'in the follow-A ing description .of .a call distributing system with reference' to the ,attached drawings, in

Figurel illustrates .the Vcalling subscriberfs line, the line `finder and the .associated con-V trolling apparatus;

Figs 2 illu-strates the operators position at the finder and connecting-lnder with their associated controlling-apparatus; and.

initiation ofv a call, current `flows fromhatf tery V5. through relay 6 whichjis common' to a group oflines terminating on the contact points which .constitute .one level. in a .group of lline finder switches,v through line relay 7,

contact'S; of cutoiii relay 9, line conductor fi, Y

switch hook 2.line conductor 3 and contact lOofcuto'f: relay 9, to earthQf The current in this'path actuates group relay'G and linexre-Y lay 7...?"l`lneV actuation of relay `6 closes its contact 12,. thus completing ar4 circuit from earth,through .conductor vlwhich is common .to contact points similar to 12 onall'of the group relays .(5 associated withthe subscriher'sflines terminating in one `group of linefinder switches, through sequence switch Fig. 3- illustratesfthe operators listeningv y V52 ofthe callin lline, a circuit is completed lfrom battery t rough contact 54 of ,the'line relay 7 non-inductive resistance` 55,A contact point 42, and brush 40, sequence switchgcon` tact 104-. 4, conductorv 26, high resistance coil 27 oftest relay 28, and the coil of test relay 29 te ground. vRelay29 is,- however, short-circuitedvat;l this-time by a path to ground 'through contact 114-4, contact arm 38, and track -24"to ground. I open only when roller 37Y is positioned ina depressionV in vr.This path is track 2 4, whiclio'ccurs only when the brushes 40,47, 48 'and 49V are centered `on a set ofline contacts. Test relay 28. is 'energized vthereby closing contact V30 and shuntingrthe'- high Vresistance winding 27 .the low resistance winding 31'. This re-.f

diices ,thetest'potential on contact 42,so

' that the subscriber7sfline in question, cannot be .selected by another switelrof the `When theY group in wh-ichit terminates.

switch brushes are centered on the contacts vof theA calling line, the path to rcground through roller 37 opens andl relay29 operates thereby opening-the''circuitv of clutch magnet 43,tlius stopping i the rotation of the shaft 44 and leaving the brushes 40, 47, 48 and 49v in engagement with the contact points'42`, 50, 51 and 52 ofthe calling line. The voperationof testrelay 29Ycloses contact y35, thus completing a circuit from ground,

through conductor 36, sequence switch contact 108-4 on the coil ofholding magnet 57,

.to batter The function of the holding magnet 5l is to jprevent Ythe inertia of the clutch disk of rthebrush carriage from carrying the brushes beyond the desired position.

-Contactl of relay 29 also now completes av circuit. through conductor 36, sequence switch contact 105%4. and the operating magnet ofsequenee switch100 to batteryv, thus niovingtlie sequenceswitch out of its fourth-andinto its fifth position. Tn this `position av circuit-is closed from ground sistance 46,v brush and the coil oficutoff relay 9 to bat-V through sequence switch contact 109--5`, re-

47, contactr50 ofthe line finder tei-y. This operates'the cut-off rela-y and opens the circuit of group relay 6 and line relayA 7.r` The potential of contact 50is thus alteredthis-change in potential providing.

` the busy. testpotentialfor the multiple contacts of the calling vline which may extend4 either tormultiple jacks Vat a manual board 1 i, jason to` terminals of. vautomatic connector switches. Y p' Y Sequence switch contact 103`5 is .now

"closed, thusconipleting a" local circuit forv tripfshaft operating magnet v16 byway of 00,' the contact between .spring 46 and arm 15, which contact is closed for all positions of the shafty 19 except the normal position.. Shaft19 will thus be returned vto normal.

i In the fifth. position ,of sequence switch 05 100'tlierlever of Contact 102, which has been standing;l in anv intermediatefl position since the first position ofthe sequence switehis 'moved tQvi-ts'lower position inyvhich itmpletes connection with' conductor. ,58 which extends through a conductor similar to andthrough another set of' sequence switch contacts similar to 102, t0 ,s the sequence switch magnet of anothery line finder. This second line finder willbe operated inpthe same manner as the one described, iproviding a second callis initiated during theuse of theplirst lline finder.l This series'of sevquence switch contacts iscarried out through the entiregroup ofline'finderlswitches' as y signed to the particular groiiprof. subscribers" lines, the Vnumber of, switches depending upon the number of ksiiniiltaneouscalls which maybe desired from a given groupofy subscribers lines.v ,A Y 1 j In'the fifth,'.positionfgofl sequence switch 100, contacts 110 land 111 are closed, vestending the A Y i switch B ofFig,2. ,y The. next stepof the line finder sequence switch 4100 is 'f dependent upon `an. impulse line conductors tothe operatorinder which will be'receiredhover conductor'60,A

from sequence .switch 200 *of Fig. `2, lthrough sequence switch contacts 1112-15. V'It is therefore now advisableto trace theo'perationiof they operators finder switch up tof the point atl which it gives the impulse overconduc-` tor 60 forlniovinq the sequence switchlOO out ofits fifth position..

As previously described, sequence switchv contact ,106.-35 Fig.A 1, completes `a circuit over conductorl 41 through the operating magnet of',A sequence switch 200,' Fig. 2 to battery and ground. The actuation ofthis magnet causes sequence switch200 toy nuwev cuits. These circuits when-idle, will; havey battery potential on contact points..68 so that the arrival of thel brush 65 -upon such a contactpoint vcompletes a circuit, through theV coil of test relay 63,-the coil of locking relay 64, sequence switch contact 203f2, f

brush 65contact 68, sequenceswitchcon-` tact 302-1 of Figf, and the coilof signal relay 69 tobattery and groundfCurrent in this path actuates relays)A and 64.A 'Re-v ii'ojV riousoperator's listening and"talkii ig' cir-1.

lay 69 is also actuated, thereby closing the quence switch contact 307-1, operatin Amagnet of sequenceswitch 300, ,to battery circuit from ground-through contact 7 0, s'e1 y 'switch operating .magnet open and no other .callscan come into the operators'position.V

In the second position of sequence switch 400 contact 40G-2 is closed, completing the circuit of the connecting'circuit indicating lamp 87 which lindicates to the operator which of the particular connecting circuits at her position has been selected. In this position also, l'sequence-switch' contact 4074-2 is closed, completing acircuit through noninductive resistance 88, contact point 89 and brush 82, through selectorswitch sequence switch contact 212-5, and the coil of the release control relay 90 to battery and ground.. Current in the' path just described actuates relayV 90', closing'its contact 9f1 to complete a'circuit throughsequence switch contact 213-5, and the coil'of sequence 200` tol battery, thus moving the sequence switch 200 out-of its fifth and into its sixth position. In moving out ofthe fifth position, contacts 206 and 207 are interrupted, disconnecting the brushes of the operators positon finder from the talking circuit. Inpos'itio'n 6 of sequence switch 200 contact 214;(5 is closed,

f thus completing circuit through conductor 60, sequence switch contact '112-5 and the coil of sequence switch operating magnet 100 to battery. AThis causes the sequence switch 100 to `move out of' its fifth and into its sixth position. When sequence Vswitch 100 leaves its fifth position, contact 109v is opened and contact 1132-6l is closed, thus shifting the control of ythe"cutofl'frelay '9 from the line finder switch tothe operators connector circuit,` circuit being nowmaintained through brush V81, contact 83, series of contacts of cutoff relay releasc'key 92, the coil of 'relay 85 and sequence switch contact 408-2 to ground. Position '6 of sequenceswitch 100 being the talking position, this switch is not again actuated until the release is desired.

In order that the operator may determine the number of the line which is calling, a bank of lamps 152 or a plurality of Vbanks ot' lamps is located in easy sight of the operator, these lamps being arranged in definite order, so thatthe number of any lamp which is displayed orflashed, may be readily dey termined from distance.

It is not always necessary for the operator tof determine the number of the calling subscribers line, or te verify a subscribers statement of his line number, but in order that this may be done when necessary, means are provided whereby the operator may flash vthelamp 151 of the call subscriber in the bank or banks. Y For this purpose theline lampV flashing key 93 is provided', which when actuated, completes a low resistance circuit through contact 89, 82 of the connecting circuit finder, ycon-tact 113-6,'brush 40 and contact point 42 or" 'the i 55 line finder vswitch andr the coil ofrelay 94 engagement to battery and ground through the back.

contact 53 of line relay 7. The current this path actuates relay 94 which completes the circuit ofthe line number lamp 151 the resistance 55 when the line relay, 7 is energized, cooperates with the branch that is closed by way of the' test relays 28 and 29 to'identify the line as a calling line and` stop the brushes of the line :finder switch in with the corresponding line terminals. The branch including the relay 94 that is closed when the 'line relay 7 is inert, cooperates with the branch including the flashing key 93 .to identify the line to theA operator as a particular one of the. lines which she'serves. i

Furthermore, `by adjustingfthe electrical valuesof'the branches andthe `devices ineluded in them, each branchvis adapted to cooperatel only with .its corresponding branch. Tor vprovide the Vmargin that dey termines the operation or non-operation of the test relay 27 relay 94m the normally closed `branch of the conductor extending to switch terminal 42 may have a resistance of 1000 ohms, while the vrcoil` 55 included in the alternate'branch of the conductor may tion of the relay 94 is obtained by making the normal path .through the windings of the test relays 28 and 29 of high resistance by including. a resistance 88 of, say, 400 ohms inthe extension of the conductor by way of the finder `switch B,- and by arranging .the flashing key 93 to connect theconductor directly to ground. Theadjustments of the relays are such that the test relay 27 is actuated only when a line is encountered with its rela-tively low resistance branch closedv by way of the 'front contact of the line reley 7; andso that the relay 94 is Vactuated only when a low resistance path for the flow of current through it is closed by the operation of the flashing 'key 98. y,

After the operator has terminated her conversation with the calling subscriber and has taken the first step toward securing connection with thedesired subscribers line, which may be either by means of automatic Switches or a plug and jack, shefdepresses her listening cutoff keyA 95, which closes a circuit through sequence switch contact 409-2, andV through the coil `of sequence switch operating magnet 400 to battery. This causes sequence switch 400 to move Out.

jacks It sometimes occurs that an operator will for some reason Wish'to hold thev connection betweena calling subscribers line and one of her vconnecting circuits, for the purpose of,"f`or exalnplay notif ing the calling subscriber when asubscri ers line which tests busy., becomes available. .During'this time it is not desired that the calling subscribers line shall, be rendered available to other desiring connection therewith. The con-,-

necting operator is therefore provided with key 92,` Which When` actuated, 'severs the holding circuit for the cutoff 'relay 9 and at the same time removes the busy potential from the contact point and its multiple contact points, which may be either the test contact points of multiple or the test contact points of any automatic'- connectory sWitch.- 'Ihe "operators position rvis also provided With a key 150, which when actuated, connects a source .of current of aA particular strength or character to 'actuate a message register.

Incase the operator decides to hold the connection inthe above described. manner,

she will instruct the calling subscriber to refrain from initiating new calls until he is notiied lby available. If, ynotwithstanding these 1n-V structions, the callingV subscriber does initif ate aV call, then, due to the energization of relay 96, the answering supervisory lampy A actuating her key 98.

having terminals at the operators positionA will gbe eX- tinguish'ed, sever `the connection thatfhas been .held by Beforevthus severing the connectiomfthe operator will preferably first actuate her manual listening invley (Fig. 3) to ascertain Whether the subscriber has initiated a new call, or Whether he has removed his receiver `from the svv'itchhook in answering a call.` Before signaling the callin-g subscriber that the called line became available, the operator may actuate her manual' listening in liey to ascertain;

Whether the calling subscriber is engaged in av conversation. It should be noted that the resistances of the repeating coil and relay 96 (Fig. 3) are of such value that ringing current appliedto the calling line While a connection is lbeing held will not be diverted to an extent thativould interfere With'the proper operation of the bell at the subscribersk station.

'While this invention is shown and describ'ed with reference to a particular em" bodiment, obviously it is susceptible of lInany modiicationsvvithout departing from its spirit or scope.

What is claimed is: j Y y 1.*In a 'telephone exchange system, the combination with lines, and a line selector forV said' lines arranged in groups, a plurality of multiply connected' one for eachv group, a brush carrier her that the desired line became whereupon the operator can Iin that group.

adjustment 'of said brush selector mechani0y Vism in accord-ance vvithithe group in which Y the terminal ofsaidV selectable line lies and adjustment of said brush' carrier in accordance with the location of said terminal in that group. v

2. In a telephone' exchange system, the combination withV lines and a line selector having line terminals l arranged in coor-v dinate groups, aV plurality/of brushes connected in multiple, a brush carrier anda brush selector, of means for rendering any of said terminals selectable, and means Vfor starting and automatically 'operating said line selector by adjustment of said brush selector and `said vbrushcarrier, respe'cso tively, in accordance with the location oi a selectable terminal in said coordinate grot-lips. l v

3. In a vtelephone exchanger system,- the combi-nation With a plurality of lines' arranged in Igroups and a brush carrier having a plurality of multiply connected sets o'fl brushes, o a brush selector, a contact, membfercar'ried by said brush selector, contact points, one foreach of said line groups vadapted for cooperating with said member,

and means operable'by a' calling linefo'r rendering 'one ofV 'said Contact points selectable and means for starting and 7for adjusting' said brush selectoraccordance it() and means `oroperat`ing said selector in its I1() first movement to Iind a group -containing a selectable terminal vand thereupon to connect With said call receivingdevice and in its second movement to und a selectable terminal 5. In a. telephone exchange system, the combination With a line selector having terminals arranged in groups, said selector being adjustable in successive. movements to connect ^with any terminal, 'of a call receiv- 120 ing device for each of said groups, means for rendering any of said terminals selectable, and means for operating said'selector in its r'st movement to find a group containing a selectable terminal and Ythereupon tov conl125 nect with saidcall receiving device and 1n its second rnove'inent'tofind a selectablegterminal in that group and thereupon Yto disconnect said call receiving device,

6.111 a telephone exchange' system, a pluv1 so operators position,

of said positions, and any of said lines, ofv

circuits apportioned to said positions, and

automatic means for distributively connecting calling lines to said connecting circuits, of an indicating signal for each subscribers line, and means at each position igor actuating the ,signal of a calling line connected to any connecting circuit of that position.

19. In au automatic call distributing system, a plurality oit' lines, operators positions, an indicating signal individual to each'ot1 said lines and common to said operators positions, and controllable at any time by the operatorthereat, means at each of said positions for causing at any time the display ot' the signal of a line engaged at said position.

20. In a telephone exchange system, lines, operators positions, connecting circuits at said positions, means for automatically extending a calling line to an idle connecting circuit at an idle operators position, ani' identifying signal individual to said line, and means at saidl operators position 'for actuating said signal.l A y 2l.-In a telephone vexchange system, lines, connecting circuits at said positions', means 'for `automatically extending a calling line to an idle connecting circuit at an idle operators position, an identifying signal individual to said line, and means associated with said connecting circuit and controllable at said operators position for displayino' said signal.y

22. In a telephone exchange system, lines, a plurality of operators positions, an indicating mechanism common thereto and comprising a displayable signal individual to each of said lines, connecting circuits at said operators positions, means tor automatically extending a callingline to an idle connecting circuit at an idle operators position, and means at said position for .controlling the signal individual to said calling line.

23. In a telephone exchange system, the combination with line terminals, automat-ic l switches and a connection to any of said line terminals established serially through and by means oi a plurality of said switches of means controllable over said connection Jor producing at will a busy or 'free test condition at the connected line terminal.

24. In a telephone exchange system, a plurality of lines, operators positions,'an automatic switch tor 'extending a connection from a calling line to an operators position, and means controllable Jfrom said position over contacts *closed by said: switch for rendering said line available for other connections while continuing the connectionalready'y established.

25. In a telephone exchange system, a plurality ot' lines, operators positions, line finder switches, connecting circuit finder switches, a calling line automatically extended to an idle operators position through a line inder switch and a connecting circuit finder switch, a cutoff relay individual to said line and having its circuit carried through said line iinder switch and said connecting circuit finder switch to said operators position, and a key at said position Jfor releasing said relay. y

. 26. In a'telephone exchange system, a plurality of operators positions, a line finder switch and a connecting circuitfinde'r switch for automatically connecting a calling line with an idle operator, a control circuit extended through said switches, and a switch in said circuit whereby the operator may renderv said line available Jfor other connec-r tions while continuing the connection already established. i

27. `In a telephone evchange system, connecting' circuit finder switches, a plurality of lines terminating thereon, operators positions, line finder switches 'for automatically extending ,calling lines to said connecting circuit finder switches, connecting circuits terminating in groups on said connecting circuit finder switches and selectable thereby, an operators vtelephone set individualto each o't` sai-d groups, means on said connecting circuit finder switches for establishing a preliminary conversational connection between a calling line and an idle operator, means for subsequently connecting said line to an idle connecting circuit, connecting said operators set thereto and breaking said preliminary connection, an identifying signal individual to said line, a cutoff relay for removing busy potential from the terminals of said line, and keys within the control of said operator for actuating said signal and releasing said cutoi relay.

28. In a telephone exchange system, connecting circuit finder switches, operators. positions, line finder switches for automatical y extending calling lines to said connecting circuit inder switches,connecting circuits terminating in groups on said connecting circuitnder switches and selectable thereby, an operators telephone set individual to' each femme @fi Sn-id Canteen? jvswitches. for estebl L versati iel .connection between ,Wise` indivi u l circuit finderv "conrsindl an idle-operator,"seidfconnecting cireuit finder switchv subsequently eonneetingseid li en idledeonnecting e1rcu1t,',1neans :for

said/operators *set to said con- .tendine thiougliysa'idline finder switch j saido e ytori lindei'fswitch: and' controllable .by seidy n operator.: l f "29; Thecombin tion with efnden switch u lizvingfmeveble Ibrushes* and a, plurality of, 1 stationary `iteim1nals, ,i of 'e conne'etnig yenq` cuit extending` to seid movable i l brusll'les,`r`v l n plurality of lines? extending to seid` station-v avyterminals,'

luratlity` of line identifying Ineansessociated with; each line',=ai1d zajo paretus associated' with seidconnectingucr- -f euit'encl` adapted for 'sellery ive cooperation Withvvseld difieren l identifyingl sans. f 30; lie cmnblnationy Kwlth ai telephone line, rOff switchy Controlling-lineari ,f a luie finder switch f brushesy responsive to the closurer Of :ad pai ticulai l ngv "to said.stations finiA l n g @nieu and adapted e zeeopei'etiol W1 thvytbe d1 fiere n Ineens of connectedv line.

f bevind lwobianches, ineafns associated with` ,Y n l,

veach line foriclosing one oit'seid branches a calling .line u an identifying signalin to enga, e1 said `terminals "mesi havin circuity and `adented nto yeooperate :with said special a ycharacteristie; identifying ineens.

`societed therewith,y a. connectingr circuit,l

switching-'1 mechanism adapted to `asser-inve tlie various: devices and the Corresponding l identifying means Withv each` other iny 'differ- .entst'ges 'of the operation.; v, y .Y [34. The ,colnbinetionrf-With-a `telephone line having f en .associated yductoigbf twov identifyingmeans `arranged for alternativek association Withgsaid `identif tying conductor, `a switch for" 'controlling lsaid `alternative association zof ,said difyferent Ineens With saidrconduetoi', `a con` `meeting circuit adapted tol be extendedfto seid line@ vand havingy a conducton for completingthe" circuit of Asaid,identifying confduetoiy. and two` devices `adapted to` bev `brought alternatively into operative relation f With-:seid lest-mentioned eaehvndepted to coopeiete'with a .diiferent one oi"seididentifyinglIneens;` 'dentifying device-, e relay foi bringing said nea'n *a yd devicefalternativelyinto opera- I tive `having reline "terminal `and an associated n local terminaluof' a :line relay, a .floeelcon` ting` on said local terminal sind havingtwo banehes of different elecling` thef-movementt of said lindeia ,switch ne of saidnbrenclies, mechanism in-v eluded .1n `the othery bien `associated v with 4seid switch v 1 sets of stationary terminals adapte( engaged thereby, oliey eonneeting;` ciifeui't con? nectedawith seid movable" brushes4 av plu'-k i'elity oflineseonnectedwith 'seid plurality' of vsetsof stationary terminals, 'an ident' ing? conductor `associated 1 set; each identifying'conduetoi inthe".` act of calling means associated Hwitl seid "switch d .iesrponsiifelto.y the elosu orl stoppingtlie brushes ine itliv rthe corresponding 'y line. `te

' Ini1iels,-1nen nude operativein the engage@ i vinent-jQf'thebrusheswith seid terininalslfor i conductor;

ning im apparatus*j associated With'sa" t c'o nlieetirig"`v closing sziidothen branch of the. identifying edapted'ltolbe ooi rolled ove said last-mem tionedbranch. s

33. The coinbi'netion Withr af telephone y line,@of e:fpluielity-` 'of identifying'means esidentifying con!` i" f' conductor,y and 35iy The combination With a `,telephone line.

brushes adapted for control`" andi-apparatus; hes adapted; ineehei sm'r`wlien-tb f finden switch:

fitliyeaehline `and y thv one terminal ofthe eorre,`

and 1line identifyingmechanism Y to the extended line.

38. In a telephone system, the combination with a plurality' of lines, an operators position and an extension circuit for extending any one of said lines to said position, of normally inactive apparatus for indicating the identity of an extended line, and means controllable at any time by the operator to render said apparatus active.

39. In a telephone system, the combination with a plurality of lines, an operators position and an extension circuit for extending any one of said lines to said position, of normally inactive apparatus adapted to give a different signal indication for each of said lines, and means controllable by an operator to render said apparatus active to give the signal indication corresponding to an extended line.

, 40. In a telephone system, the combination with a plurality of lines, an operators position and an extension circuit for extending any one of said lines to said position, of normally inactive apparatus for indicating Vthe ident-ity of an extended line, means for con-` necting said extended line with another line, and means operable at will during the continuance of said connection for rendering said identifying apparatus active.

41. In a telephone system, the combination With a plurality of lines, of means for extending any one of said lines to an operators position and there connecting it with another of said lines, normally inactive apparatus adapted to give a different signal indication for eacli line which may be extended to said operators position, and means operable at will during the continuance of a connection for making said apparatus active to give the signal indication corresponding to the extended line.

42. In a telephone system, the combination with a plurality of lines, an operators position, a connecting circuit` for extending the circuit of any one of said lines to said position and there connecting it to another of said lines, of apparatus for giving a different signal indication for each of said lines the circuit of which may be extended, and means associated with said connecting circuit for rendering said apparatus active to give its signal indication atany time during the continuance of said connection.

43. The combination with an operators position, of a plurality of connecting. circuits therefor, a switch for extending calls to said position, said switch being adapted to select said position and then one of the connecting circuits thereof, a signal at said position,

and means made operative upon the selection of said position for operating said signal.

44. The combination with an operators position, of a plurality of connecting circuits therefor, a switch for extendingcalls to said position, said switch being adapted to select said position and then one of the connecting circuits thereof, a signal at said position, means made operative upon thev selection of said position for operating said signal, and means actuated upon the selection of a connectin circuit for withdrawing said signal. 45. he combination with an operators position, of a plurality of connecting circuits therefor, a switch for extending calls to said position, said yswitch .being adapted first to select said position and then one of the connecting circuits thereof, a common calling signal at said position, an individual calling sgnal for each of said connecting circuits, means made operative upon the selection of said position for operating said common signal, and means actuated upon the selection of a connecting circuit for operating the individual calling signal of the circuit and withdrawing said common signal. i 46. The combination with a plurality of connecting circuits divided,v into groups, of a Yplurality o-f finder switches for' making connection therewith, means for causing a finder switch to select a particular group of circuits, and means for preventing another finder switch from selecting said group until after the first switch establishes connection with one of the circuits of said group.

47. The combination with an operators position, of a group of connectin circuits at said position, to said connecting circuits, an automatic listening key for each circuit, means responsive to the extending of a call to one of said circuits for operating the associated listening key, and means for preventing the extension of a call to any other of said connecting circuits while the listening key of one ofv said circuits is operated.

In witness whereof,we hereunto subscribe our names this 31 day of March, 1919.

EDWARD B. CRAFT. JOHN NEWBERRY REYNOLDS.

means for exten ing calls 

